Akermanite Yang H, Hazen R M, Downs R T, Finger L W Physics and Chemistry of Minerals 24 (1997) 510-519 Structural change associated with the incommensurate-normal phase transition in akermanite, Ca2MgSi2O7, at high pressure Sample: P = 1.25 GPa _database_code_amcsd 0008032 CELL PARAMETERS: 7.8071 7.8071 4.9821 90.000 90.000 90.000 SPACE GROUP: P-42_1m X-RAY WAVELENGTH: 1.541838 Cell Volume: 303.663 Density (g/cm3): 2.981 MAX. ABS. INTENSITY / VOLUME**2: 22.41309415 RIR: 2.448 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 16.05 9.64 5.5205 1 1 0 4 17.80 1.26 4.9821 0 0 1 2 21.15 7.20 4.1998 1 0 1 8 22.78 2.77 3.9035 2 0 0 4 24.06 11.51 3.6986 1 1 1 4 25.51 3.94 3.4914 2 1 0 8 29.06 22.86 3.0727 2 0 1 8 31.28 100.00 2.8592 2 1 1 8 32.44 3.81 2.7602 2 2 0 4 36.06 1.57 2.4911 0 0 2 2 36.39 16.33 2.4688 3 1 0 8 37.24 5.70 2.4144 2 2 1 4 37.91 6.26 2.3732 1 0 2 8 39.05 7.25 2.3066 3 0 1 8 39.70 2.47 2.2706 1 1 2 4 40.79 1.64 2.2121 3 1 1 8 44.69 12.86 2.0278 2 1 2 8 45.69 2.60 1.9859 3 2 1 8 46.53 6.03 1.9518 4 0 0 4 48.05 6.59 1.8935 4 1 0 8 49.27 4.02 1.8493 2 2 2 4 49.54 10.12 1.8402 3 3 0 4 51.64 9.28 1.7700 4 1 1 8 52.16 20.37 1.7535 3 1 2 8 52.41 6.07 1.7457 4 2 0 8 53.05 3.33 1.7262 3 3 1 4 56.29 2.34 1.6342 3 2 2 8 57.99 1.70 1.5903 1 1 3 4 60.59 1.38 1.5282 2 0 3 8 61.87 4.79 1.4997 2 1 3 8 62.78 1.32 1.4801 3 3 2 4 63.57 2.63 1.4635 5 1 1 8 65.61 4.81 1.4230 2 2 3 4 66.83 2.69 1.3999 3 0 3 8 67.26 9.24 1.3920 5 2 1 8 67.92 3.04 1.3801 4 4 0 4 70.85 1.68 1.3300 4 4 1 4 71.28 1.44 1.3230 4 3 2 8 72.67 3.24 1.3012 6 0 0 4 75.94 1.37 1.2530 5 2 2 8 76.26 4.25 1.2485 4 1 3 8 76.48 1.27 1.2455 0 0 4 2 76.67 1.13 1.2429 6 1 1 8 77.41 2.14 1.2329 3 3 3 4 80.09 1.88 1.1982 6 2 1 8 81.23 2.37 1.1843 5 4 1 8 81.64 1.17 1.1793 5 3 2 8 83.89 2.00 1.1533 6 0 2 8 85.33 1.39 1.1376 4 3 3 8 86.45 2.45 1.1257 5 1 3 8 86.66 1.27 1.1235 3 0 4 8 87.78 1.13 1.1120 3 1 4 8 88.37 1.12 1.1061 6 2 2 8 89.80 1.31 1.0921 5 2 3 8 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.